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Poolside Alarm. Jay Bombien – BSEE Lead Report Manager Darren Pallesen- BSEE Lead Project Integrator Louis Chatfield- BSEE Lead Presentation Manager Peter Brunner- BSEE Lead System Designer Milja Cumbo- BSEE Lead Manufacturing Mgr. Major Functions and Features. Functions:

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Poolside alarm
Poolside Alarm

  • Jay Bombien – BSEE

    • Lead Report Manager

  • Darren Pallesen- BSEE

    • Lead Project Integrator

  • Louis Chatfield- BSEE

    • Lead Presentation Manager

  • Peter Brunner- BSEE

    • Lead System Designer

  • Milja Cumbo- BSEE

    • Lead Manufacturing Mgr


Major functions and features
Major Functions and Features

  • Functions:

    • Monitor a pool for potential hazardous situations

    • Loud audible alarms when a child falls in unnoticeably

  • Features:

    • Outdoor unit will display water temp, air temp, and low battery indicator

    • Solar cells on poolside unit to keep outdoor battery charged

    • User Control On/Off


Poolside alarm1
Poolside Alarm

  • The device will monitor a pool for potential hazardous situations. (i.e. child falling in)

  • Indoor unit will display water temp, air temp, and low battery indicator.

  • Wireless home receiver and display unit with loud audible signal.

  • Solar cells on poolside unit to keep outdoor battery charged.


Similar existing product

Poolside Alarm

Similar Existing Product


Poolside alarm block assignment
Poolside Alarm Block Assignment

Louis

Peter

Jay

Darren

Milja

Outdoor

Indoor

Power Supply

Power Supply

Air / Water

Sensor

Alarm

RF

Transceiver

Wave

Sensor

Indoor MPU and Display

Motion

Sensor

Data Lines

Power Lines

Alarm


Standard requirements
Standard Requirements

System Standard Requirements:

Market:

  • Est. Total Market Size $1,000,000

  • Est. Annual Vol. 3,000

  • Min. List Price $250

    Manufacturing:

  • Min. Total Parts Count 160

  • Max. Unique Parts Count 50

  • Max. Parts & Materials Cost $175

  • Max. MFG Assembly / Test Cost $50

    Life Cycle:

  • Est. Max. Production Lifetime 10 years

  • Product Life Reliability in MTBF 1.99 years

  • Full Warranty Period 30 days


Standard Requirements

Power Sources

Indoor:

  • Source(1): 120Vac 108V to 138V

    Frequency Range: 57-63Hz

    AC Power Dissipation: 400 mW

    Plugs: Type B (Flat blades with round grounding pin)

    2.1 mm male-to-female DC Plug

  • Source(2): 3AA 3.9V to 4.8V

  • Battery Power: 2000 mAh

    Outdoor:

  • Source(1): Solar Cell 13.3V to 16.2V

  • Source(2): 8AA 10.8V to 12.6V

  • Battery Power 2000 mAh

    Max. Total Power 20W


Performance requirements
Performance Requirements

Mechanical:

  • Max. Product Vol. 11,000

  • Max. Shipping Container Vol. 8,000

  • Max. Product Mass 5 kg

  • Max. # of boards 3

  • Max. Total PCB Area 425 cm2

  • Max. Shock Force

    • Indoor 50 G’s

    • Outdoor 10 G’s

  • Max. Shock Repetitions / Year 15

    Environmental:

  • Operating Ambient Temp. Range 5°C to 50°

  • Operating Ambient Humidity Range 0%Rh to 100%Rh

  • Operating Altitude Range 0.5 to 1.5 ATM

  • Storage Ambient Temp. Range -20°C to 80°C

  • Storage Ambient Humidity Range 0%Rh to 100%Rh

  • Storage / Shipping Altitude Range -100m to 3000m

  • Max Storage Duration 3 years


Safety standards
Safety Standards

  • UL 464 - Audible Signal Appliances

    • Electrically and electronically operated bells, buzzers, horns, and similar audible signal appliances intended for indoor or outdoor locations.

  • UL 1703 - Flat-Plate Photovoltaic Modules and Panels

    • Flat-plate photovoltaic modules used as either freestanding or attached to buildings

  • PS 128-01, Provisional Specification for Pool Alarms

    • Alarms sound at poolside and in adjacent buildings when a minimum weight of 18 lbs hits the water.

    • Alarms sound at poolside and in adjacent buildings that a minimum sound of 80dB at 100ft is possible

  • IEC 61558-1

    • Safety of power transformers, power supply units and similar devices


Key risk areas
Key Risk Areas

  • Developing and implementing a wave sensor could be very complicated

  • Not much market on workable child safety poolside devices

  • Difficulty to present prototype.

  • Sensor Interfacing

  • Power Supply interfacing with step-down transformer

  • Outdoor product requiring waterproofing

  • Needs to be near foolproof, should not go off with falling branches, excessive wind, etc.


Emc standard summary table
EMC Standard Summary Table

US/FCC: 47 CFR 15 - Radio Frequency Devices 47 CFR 18 - Industrial Scientific and Medical Equipment

61000-3-3 EMC Part 3: Limits - Section 3: low-voltage supplies <16A 61000-4-2 EMC Part 4: Test/measurement techniques - Section 2: ESD immunity tests 61000-4-3 EMC Part 4: Test/measurement techniques - Section 3: Radiated radiofrequency immunity 61000-4-6 EMC Part 4: Test/measurement techniques - Section 6: Conducted radiofrequency immunity 61000-4-11 EMC Part 4: Test/measurement techniques - Section 11: Voltage dips, short interruptions and variations

CISPR:11 Limits and methods of measurement for Industrial, Scientific and Medical Equipment 16 Specifications for Radio Interference Measuring Apparatus and Measurement Methods 22 Limits and Methods of Measurements of Radio Interference of Information Equipment


Design Plan Summary

Total Manpower

Estimated: 1750 hrs Available: 975 hrs

Total Material Cost

Estimated: $337 Available: $350

Percentage of total manpower

System Design Tasks: 15%

Detailed Design Tasks: 35%

Verification Tasks: 15%

Documentation Tasks: 35%


Prototype summary slide
Prototype Summary Slide

  • Total # of bds

    • 8 bds – 1 for Each Block

  • Total PCB area (cm2)

    • B1(40), B2(65), B3(40), B4(50), B5(50),

      B6(40), B7(50), B8(90)

    • Total = 425

  • Technology:

    • Perfboard, PCB, Breadboard

    • Soldering & Wirewrap



Outdoor Power Supply

Peter Brunner


Poolside alarm block assignment1
Poolside Alarm Block Assignment

Peter

Outdoor

Indoor

Power Supply

Power Supply

Alarm

Air / Water

Sensor

RF

Transceiver

Wave

Sensor

Indoor MPU and Display

Motion

Sensor

Data Lines

Power Lines

Alarm


Functional Purpose

  • To receive Infra red rays from the sun

    to charge the solar panels

  • To recharge the battery through a regulator when it loses 10% of its power.

  • To output the required regulated voltage for the other block power inputs


Performance requirements1
Performance Requirements

Electrical Interfaces:

  • Signal Type: Power.

  • Power Consumption: 2W

  • Signal Direction: Input / Output.

  • Battery Type: 8AA

  • Output Voltage:

    • Nominal: 3.3 Range: 3-3.6

    • Nominal: 12 Range: 10.8-13.2

    • Nominal: 9 Range: 8.1-9.9

  • Output Current max. : 1 A

  • Input Voltage:

    • Nominal: 15.4 Range: 13.3 – 16.4

  • Input Current max: 120 mA

    Safety Standard:

  • UL 1703 - Flat-Plate Photovoltaic Modules and Panels

    EMC Standard:

  • EMC 61000-3-3: Limitation of voltage fluctuations and flicker in low-voltage supplies <16A


  • Standard requirements1

    Mechanical

    Block cost <$65

    Parts count <15

    Unique parts count <6

    PCB Area 40 cm2

    Environment:

    Operating temperature range 5 to 55 C

    Storage temperature range -20C to 65C

    Operating humidity 0 to 100%

    Life Cycle

    Reliability MTBF 237.3 years

    R(1 warranty) 99.7%

    Disposal Throw away

    Percent Allocations 26% of cost

    10% of parts

    9% of PCB area

    Standard Requirements


    Block assignment
    Block Assignment

    Sun

    15.4V

    12V

    Charging Circuit

    Battery

    Switching Regulator

    3.3V

    9V

    Other Blocks



    Parts Count Reliability

    • Total Fits = 480.77, Total MTBF (yrs) = 237.3

    • R(30 day warranty) = e^(-0.8/237.3) * 100% = 99.7%

    • Dominant Failure part is the Flexible Solar Panel. Not much can be done to improve this part for higher reliability.



    Indoor Power Supply

    Jay Bombien


    Poolside alarm block assignment2
    Poolside Alarm Block Assignment

    Jay

    Outdoor

    Indoor

    Power Supply

    Power Supply

    Alarm

    Air / Water

    Sensor

    RF

    Transceiver

    Wave

    Sensor

    Indoor MPU and Display

    Motion

    Sensor

    Data Lines

    Power Lines

    Alarm


    Indoor power supply
    Indoor Power Supply

    Block Description and Purpose:

    • Electrical device that will transform the standard wall electricity (AC) to lower voltages (DC).

    • The DC voltage will power the indoor control panel, RF transceiver, and the alarm.

    • Will charge the battery unit used as the backup power system.


    Block cost <$25

    Parts count <18

    Unique parts count <8

    PCB Area 65 cm2

    Power consumption 3 W

    Operating temperature range 5 to 55 C

    Storage temperature range -20C to 65C

    Reliability MTBF 7.8 years

    Operating humidity 0 to 100%

    Disposal Throw away

    Percent Allocation:

    Cost: 10.0%

    Parts: 11.25%

    PCB: 15.29%

    Indoor Power Supply

    Standard Requirements


    Indoor Power Supply

    Performance Requirements

    * Electrical Interfaces:

    • Signal Type:Power

    • Signal Direction: Input / Output.

    • Output Voltage: Nominal: 3.3 VDC (Range: 3.0 – 3.6 VDC)

    • V-Ripple max. :100 mV

    • Output Current max. : 1 A

    • Input Voltage: Nominal: 120 VAC (Range:108 - 138 VAC)

    • Input Current max:1.038 A

      Safety Standard:

    • IEC 61558-1: Safety of power transformers, power supply units and similar devices EMC Standard:

      EMC Standard:

    • EMC 61000-3-3: Limitation of voltage fluctuations and flicker in low- voltage supplies <16A


    Indoor Power Supply

    AC/DC

    Converter Block

    DC Regulator

    Circuit

    Battery

    Charger Circuit

    Converter/Charger

    Switch

    Alarm

    Battery

    DC Regulator

    Circuit

    Indoor MPU and Display


    Signal input output summary

    Indoor Power Supply

    Signal Input/Output Summary


    Indoor Power Supply

    Prototyping Plan


    Indoor Power Supply

    Block Parts Count Reliability

    • Total FITs: 14620 Total MTBF (years): 7.8

    • The MOS Digital ICs are most unreliable

    • R = 90.25%


    Indoor MPU and Display

    Darren Pallesen


    Poolside alarm block assignment3
    Poolside Alarm Block Assignment

    Darren

    Outdoor

    Indoor

    Power Supply

    Power Supply

    Alarm

    Air / Water

    Sensor

    RF

    Transceiver

    Wave

    Sensor

    Indoor MPU and Display

    Motion

    Sensor

    Data Lines

    Power Lines

    Alarm


    Indoor mpu and display block description
    Indoor MPU and DisplayBlock Description

    • Allows user to turn the unit on/off. Also allows user to deactivate both alarms from inside.

    • Receives signals from the transceiver (alarm activated, alarm deactivated from outside, outdoor unit power off, and low battery).

    • Transfers signals to alarm (activate/deactivate).

    • Sends signals to the indoor display unit for user visibility (power on, low battery, alarm activated).


    Indoor mpu and display performance requirements
    Indoor MPU and DisplayPerformance Requirements

    User Indicators and Displays:

    • Indicator Parameters: Power On, Outdoor Unit Power Off, Low Battery, Alarm Activated.

    • Indicator Color and Type: Amber LED, Green LED, Green LED, Red LEDs.

    • Indicator Viewing Environment: Indoor Lighting, Complete Darkness.

      Electrical Interfaces:

    • Power Consumption: 1 W

    • Signal Types: DC Power, Digital.

    • Signal Directions: Input, Bi-Directional, Output.

    • Input Nominal Voltage: 3.3 VDC Range: 3.0 VDC – 3.3 VDC

    • Input Current Max: 24 mA

    • Output Nominal Voltage: 3.3 VDC Range: 3.0 VDC – 3.3 VDC

    • Output Current Max: 24 mA

      EMC Standard:

    • 61000-4-2 EMC Part 4: Test/measurement techniques - Section 2: ESD immunity tests


    Indoor mpu and display standard requirements

    Mechanical:

    Block Cost < $25

    Parts Count < 16

    Unique Parts Count < 5

    PCB Area 40 cm2

    Environmental:

    Operating temperature range 5 to 55 C

    Storage temperature range -20C to 65C

    Operating humidity 0 to 100%

    Life Cycle:

    MTBF(years) 183.53 years

    R(warranty) 99.57%

    Disposal Throw away

    Percent Allocation:

    Block Cost 10% of Total

    Parts Count 10% of Total

    PCB Area 9% of Total

    Indoor MPU and DisplayStandard Requirements


    Indoor mpu and display block detail
    Indoor MPU and DisplayBlock Detail

    Alarm Turn-Off

    User

    Control

    Power Supply

    Power On / Off

    3.3V

    Alarm Activated

    MPU

    RF

    Transceiver

    Alarm Turn-Off

    Alarm On / Off

    Low Battery

    Alarm

    Outdoor Unit Power Off

    Alarm Turn-Off

    Outdoor

    Unit

    Off

    Digital Signals

    Low

    Battery

    Alarm

    Activated

    Power On

    Analog Signals

    Display (LED Indicators)


    Indoor mpu and display electrical interfaces
    Indoor MPU and DisplayElectrical Interfaces


    Indoor mpu and display parts count reliability estimation
    Indoor MPU and DisplayParts Count Reliability Estimation

    • MTBF(years) = 183.53

    • R(30 day warranty) = e^-(0.8 / 183.53) = 0.9957 = 99.57%

    • The dominant part for unreliability is the CPLD chip. Not much can be done to improve the reliability of this part because of the amount of gates in the IC.


    Indoor mpu and display block prototyping plan template
    Indoor MPU and DisplayBlock Prototyping Plan Template


    Wave Sensor

    Jay Bombien


    Poolside alarm block assignment4
    Poolside Alarm Block Assignment

    Jay

    Outdoor

    Indoor

    Power Supply

    Power Supply

    Alarm

    Air / Water

    Sensor

    RF

    Transceiver

    Wave

    Sensor

    Indoor MPU and Display

    Motion

    Sensor

    Data Lines

    Power Lines

    Alarm


    Wave sensor
    Wave Sensor

    Block Description and Purpose:

    • Sensing unit that will detect the presence of wave motion in the pool.

    • This signal will be passed through an A/D converter and then on to the RF transceiver.


    Wave sensor1

    Block cost <$20

    Parts count <12

    Unique parts count <2

    PCB Area 30 cm2

    Power consumption <2.25 W

    Operating temperature range 5 to 55 C

    Storage temperature range -20C to 65C

    Reliability MTBF 9.9 years

    Operating humidity 0 to 100%

    Disposal Throw away

    Percent Allocation:

    Cost: 8.0%

    Parts: 7.5%

    PCB: 7.05%

    Wave Sensor

    Standard Requirements


    Wave sensor2
    Wave Sensor

    Performance Requirements

    * Electrical Interface:

    • Signal Type: Power.

    • Signal Direction: Input

    • Input Nominal Voltage: 9 VDC (Range: 8.1 – 9.9 VDC)

    • Input Current max: 0.5 A

      * Data Interface:

    • Signal Type: Digital

    • Signal Direction: Output

    • Input Nominal Voltage: 1.4 VDC (Range: 0.8 – 2.0 VDC)

    • Input Current max: 5 uA

      EMC Standard:

    • 61000-3-3 EMC Part 3: Limits - Section 3: Limitation of voltage fluctuations and flicker in low-voltage supplies <16A

    • 61000-4-11 EMC Part 4: Test/measurement techniques - Section 11: Voltage dips, short interruptions and variations


    Wave sensor3
    Wave Sensor

    Outdoor

    Power Supply

    Oscillator Circuit

    Voltage Comparator

    RF

    Transceiver

    Wave Sensing Unit

    Data Lines

    Power Lines


    Signal input output summary1

    Wave Sensor

    Signal Input/Output Summary


    Wave sensor4
    Wave Sensor

    Prototyping Plan


    Wave Sensor

    Block Parts Count Reliability

    • Total FITs: 11577 Total MTBF (years): 9.9

    • The MOS Digital ICs are most unreliable

    • R = 92.24%



    Poolside alarm block assignment5
    Poolside Alarm Block Assignment

    Peter

    Outdoor

    Indoor

    Power Supply

    Power Supply

    Alarm

    Air / Water

    Sensor

    RF

    Transceiver

    Wave

    Sensor

    Indoor MPU and Display

    Motion

    Sensor

    Data Lines

    Power Lines

    Alarm


    Function
    Function

    • To measure the current pool water and outdoor air temperature

    • To convert the temperature into a positive digital voltage to be sent to the MPU with an accuracy of ±3C (max) over a range of 5C to 55C


    Performance requirements2
    Performance Requirements

    • Voltage

      • Power Consumption: <5 W

      • Supply = 3.3V ± 10%

      • Output = 3.3 V high, 0V low

        • A/D converter: 8-bit.

      • Input = 0 – 2.048 Vac

    • Current

      • Output < 25 mA

    • Accuracy

      • ±3C over full range

      • .195C / bit

    • EMC Standard:

      61000-4-2 EMC Part 4: Test/measurement techniques for ESD immunity tests


    Standard requirements2

    Mechanical

    Block cost <$35

    Parts count <25

    Unique parts count <8

    PCB Area 50 cm2

    Environment:

    Operating temperature range

    Water 5 to 55 C

    Air 5 to 55C

    Storage temperature range -20C to 65C

    Operating humidity 0 to 100%

    Life Cycle

    Reliability MTBF 403.5 years

    R(1 Warranty) 99.8%

    Disposal Throw away

    Percent Allocations 14% of cost

    16% of parts

    12% of PCB area

    Standard Requirements


    Block assignment1
    Block Assignment

    3.3 V

    Power Supply

    Temp

    Sensors

    Low-Pass Filter

    (Passive)

    Amplifier

    A/D converter

    8-Bit

    Data Lines

    Power Lines

    RF Transceiver



    Parts Count Reliability

    • Total Fits = 282.7, Total MTBF (yrs) = 403.5

    • R(30 day warranty) = e^(-0.8/403.5) * 100% = 99.8%

    • Dominant Failure part are the CMOS A/D converters. Not much can be done to improve these.



    Motion Sensor

    Louis Chatfield


    Poolside alarm block assignment6
    Poolside Alarm Block Assignment

    Louis

    Outdoor

    Indoor

    Power Supply

    Power Supply

    Alarm

    Air / Water

    Sensor

    RF

    Transceiver

    Wave

    Sensor

    Indoor MPU and Display

    Motion

    Sensor

    Data Lines

    Power Lines

    Alarm


    Function1
    Function

    • This block utilizes a passive motion IR motions signal which is when tripped by a person near a pool.

      • IR sensor detects body heat from a human sends a signal

    • The motion sensor sends a digital signal to the Outdoor MPU.

    • Once the Outdoor MPU receives this signal, it triggers the indoor and outdoor alarms.


    Performance requirements3
    Performance Requirements

    • Power Inputs

      • DC Power 10 – 13 VDC

      • Current Draw <= 17 mA

    • Coverage Wide Angle

      • 40 ft x 40 ft (12m x 12m)

      • Actual Beam Coverage: 40 ft x 20 ft (12m x 6m)

    • Electrical Interfaces

      • Digital input from motion sensor

      • Digital signal is conveyed the outdoor MPU

    • Safety Standards:

      UL 508C – Power Conversion Equipment

      UL 2017 – General Purpose Signaling Devices and Systems

      IEC 61000-4-2 – Electro Static Discharge


    Standard requirements3
    Standard Requirements

    Mechanical

    • Block cost <$30

    • % Cost Allocation 20%

    • Parts count <25

    • Unique parts count <5

    • PCB Area 60 cm2

      Environment:

    • Operating temperature range 5 to 55 C

    • Storage temperature range -20C to 65C

    • Operating humidity 0 to 100%

      Life Cycle

    • Reliability MTBF 28.3 years

    • Disposal Throw away


    Block diagram
    Block Diagram

    OUTDOOR

    POWER SUPPLY

    9V

    PASSIVE IR SENSOR

    9V – 16V

    REGULATOR

    12 VDC

    POWER

    POWER

    POWER

    OUTDOOR MPU

    RF TRANSCEIVER

    FILTER/ SMOOTHING

    CIRCUIT

    REGULATOR

    3 V

    SIGNAL

    SIGNAL

    SMOOTHING: KEEPS DC VARYING TO ONLY A SMALL RIPPLE

    REGULATORS: ELIMINATES RIPPLE BY SETTING DC OUTPUT TO FIXED VOLTAGE



    Parts count reliability estimation
    Parts Count Reliability Estimation

    MTBF = 28.3 YEARS. RELIABILITY = 97 %

    MOST DOMINANT PART RELATED TO UNREALIABILITY IS THE CAPACITORS



    RF Transceiver

    Milja Cumbo


    Poolside alarm block assignment7
    Poolside Alarm Block Assignment

    Milja

    Outdoor

    Indoor

    Power Supply

    Power Supply

    Alarm

    Air / Water

    Sensor

    RF

    Transceiver

    Wave

    Sensor

    Indoor MPU and Display

    Motion

    Sensor

    Data Lines

    Power Lines

    Alarm


    Rf transceiver block purpose and description
    RF Transceiver Block Purpose and Description

    • Block Purpose

      To process and control data from sensors, power supplies, and switches

      To transmit and receive data between outdoor and indoor units

    • Block Description

      Read input digital signals from sensors into the Outside Controler

      Send processed data to the Outdoor Transceiver

      Control push button switch with debounce component and ESD

      protection

      Send processed digital signal to the Transceiver

      Send/Receive wireless signal to/from the Transceiver

      Send/Receive the data signal to/from the Indoor Controler


    Rf transceiver product performance requirements
    RF TransceiverProduct Performance Requirements

    • Electrical Interfaces:

    • Different Signal types: Digital, DC Power Supply.

    • Different Signal Directions: Input, Output, Bi Directional

    • Input Current max: 24 mA

    • Output Nominal Voltage: 3.3 VDC

      Output Current max: 24 mA


    Rf transceiver product safety requirements
    RF TransceiverProduct Safety Requirements

    • UL 464 - Audible Signal Appliances

      • Electrically and electronically operated bells, buzzers, horns, and similar audible signal appliances intended for indoor or outdoor locations.


    Rf transceiver product standard requirements
    RF TransceiverProduct Standard Requirements

    • Block cost <$40

    • Parts count <20

    • Unique parts count <5

    • PCB Area 50 cm2

    • Power consumption <5W

    • Operating temperature range 5 0C to 55 0C

    • Storage temperature range -20 0C to 65 0C

    • Reliability MTBF 31.36 yrs.

    • Operating humidity 0 to 100 %

    • Disposal Discard


    Emc standards summary

    US/FCC:47 CFR 15 - Radio Frequency Devices 47 CFR 18 - Industrial Scientific and Medical Equipment 61000-3-3 EMC Part 3: Limits - Section 3: Limitation of voltage fluctuations and flicker

    in low-voltage supplies <16A 61000-4-2 EMC Part 4: Test/measurement techniques - Section 2: ESD immunity tests 61000-4-3 EMC Part 4: Test/measurement techniques - Section 3: Radiated

    radiofrequency immunity tests 61000-4-6 EMC Part 4: Test/measurement techniques - Section 6: Conducted

    Radiofrequency immunity tests

    CISPR:11 Limits and methods of measurement for Industrial, Scientific and Medical Equipment

    16 Specifications for Radio Interference Measuring Apparatus and Measurement

    Methods 22 Limits and Methods of Measurements of Radio Interference of Information

    Technology Equipment

    EMC Standards Summary


    RF Transceiver Block Diagram

    digital signals

    digital signals

    Alarm Activated

    Alarm Deactivated

    Low Battery

    Power ON/OFF

    Alarm Deactivated From Inside

    Water Sensor

    Motion Sensor

    Outside Controller

    AirTemp.Sensor

    WaterTemp Sensor

    Power ON/OFF

    Low Battery

    Outdoor

    Transceiver

    Indoor Transceiver

    Outdoor Antenna

    Indoor Antenna



    Rf transceiver input output contd
    RF TransceiverInput/Output contd.


    Rf transceiver input output contd1
    RF TransceiverInput/Output contd.


    Rf transceiver parts count reliability
    RF Transceiver Parts Count Reliability

    The most unreliable part is Mos Dig IC <1000 gates(2938.24). The number of the gates cannot change.


    Rf transceiver block prototyping plan
    RF TransceiverBlock Prototyping Plan


    Alarms

    Louis Chatfield


    Poolside alarm block assignment8
    Poolside Alarm Block Assignment

    Louis

    Outdoor

    Indoor

    Power Supply

    Power Supply

    Alarm

    Air / Water

    Sensor

    RF

    Transceiver

    Wave

    Sensor

    Indoor MPU and Display

    Motion

    Sensor

    Data Lines

    Power Lines

    Alarm


    Functionality
    Functionality

    • Purpose: To sound an alarm.

    • Description:

      • Siren/horn produces a high decibel audible sound (at least 100 dB)

      • Siren/horn needs to notify the surrounding area there is a possibility of a child jumping into an unsupervised pool.


    Performance requirements4
    Performance Requirements

    • Power Inputs

      • DC Power 2.55 – 3.3 VDC

      • Current Draw <= 0.7 A

    • Output

      • Max 101 dB at 10 feet

    • Electrical Interfaces

      • Digital output is sent from Indoor MPU

      • Digital signal is amplified via audio amplifier, which is sent to the siren/horn

        Safety Standard:

    • UL 464 - Audible Signal Appliances

    • UL 1492 – Audio-Video Products and Accessories

    • IEC 61000-4-2 Electro Static Discharge Immunity


    Standard requirements4
    Standard Requirements

    Mechanical

    • Block cost <$10

    • % Cost Allocation ~7%

    • Parts count <10

    • Unique parts count <3

    • PCB Area 40 cm2

      Environment:

    • Operating temperature range 5 to 55 C

    • Storage temperature range -20C to 65C

    • Operating humidity 0 to 100%

      Life Cycle

    • Reliability MTBF 75.2 years

    • Disposal Throw away


    Motion sensor diagram
    Motion Sensor Diagram

    3.3 V DIGITAL SIGNAL

    AMPLIFIED SIGNAL

    INDOOR

    MPU

    AUDIO

    AMPLIFIER

    SIREN/HORN



    Count reliability estimation
    Count Reliability Estimation

    MTBF = 75.2 YEARS.RELIABILITY = 99 %

    MOST DOMINANT PART RELATED TO UNREALIABILITY IS THE CAPACITORS




    Reliability assessment
    Reliability Assessment

    • F(w) = 0.04 = 4% failures within the warranty period of 30 days.

    • R(w) = 0.96 = 96% reliability within the warranty period.

    • To get a reliability of R(w) = 99%, we found that we had to reduce our warranty to t = 0.02 or 7 days.

    • Our group decided to stick with the 30 day warranty so that consumers would have more confidence in our product.


    Reliability summary
    Reliability Summary

    • Most Unreliable Parts

      • CPLD

      • NPN Phototransistor

      • LM 555 IC

      • Relay

      • LM 3909 IC

      • Electrolytic Outdoor Capacitor

      • Mos Dig IC < 1000 Gates – Outdoor

      • Photovoltaic Cells

  • Improvements

    • Can research and maybe choose better qualified parts for low reliability components

    • Could buy higher efficient components, but would be much more costly.

    • Protect against voltage and current swings so parts do not get close to their max ratings.


  • Reliability growth plan outside
    Reliability Growth Plan - Outside

    - We are probably not going to test these prototypes for these types of tests except the input voltage cycles. We will probably test all prototypes for this. The other requires an environmental chamber and the G-force one could be destructive.


    Reliability growth plan outside1
    Reliability Growth Plan - Outside

    - We are probably not going to test these prototypes examples for these types of tests except the input voltage cycles. We will probably test all prototypes for this. The other requires an environmental chamber and the G-force one could be destructive.


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